CN113417711B - Phaser control duty ratio correction method and system and vehicle - Google Patents
Phaser control duty ratio correction method and system and vehicle Download PDFInfo
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- CN113417711B CN113417711B CN202110867734.XA CN202110867734A CN113417711B CN 113417711 B CN113417711 B CN 113417711B CN 202110867734 A CN202110867734 A CN 202110867734A CN 113417711 B CN113417711 B CN 113417711B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a method, a system and a vehicle for correcting a control duty ratio of a phaser, which comprises the following steps: the method comprises the following steps: starting the engine, acquiring the ambient temperature, and executing the second step if the ambient temperature is greater than a first preset temperature; if the environmental temperature is less than or equal to the first preset temperature, executing the third step; step two: executing normal PID control logic, and step three: executing a modified PID control logic; step four: judging the water temperature T of the engineewIf the temperature is higher than the second preset temperature and the engine starting time is higher than the first preset time, executing a second step if the temperature is higher than the second preset temperature and the engine starting time is higher than the first preset time; otherwise, executing the step five; step five: estimating the temperature T2 of the engine oil control valve based on the duty ratio of the holding position; step six: judging whether the difference value of the T1 and the T2 is smaller than a third preset temperature or not, if so, executing a step three; otherwise, executing step seven; step seven: PID control logic that performs feedback self-learning corrections. The invention ensures that the VVT control uses the most appropriate duty ratio parameter.
Description
Technical Field
The invention belongs to the technical field of internal combustion engine control, and particularly relates to a method and a system for correcting a control duty ratio of a phaser, and a storage medium.
Background
In order to ensure good economy and emission, the application of internal combustion engines in automobiles generally adopts Variable Valve Timing (VVT) technology, which includes a camshaft phaser and an oil pressure control Valve, wherein the oil pressure control Valve controls the oil circuit variation of the camshaft phaser, so that the appropriate oil circuit and oil pressure push the rotor in the camshaft phaser to rotate at a specified phase angle, thereby implementing the function of VVT.
The control of the general engine oil pressure control valve is an analog control method adopting PWM (pulse width modulation), and the voltage of the engine oil pressure control valve can be changed by adjusting and changing the duty ratio of the PWM, so that the internal current is changed and electromagnetic force required correspondingly is produced, and a valve core in the engine oil pressure control valve is pushed to move to a corresponding position to change an oil way or flow.
When the device is applied to phasers such as a middle lock VVT (variable valve timing) phaser, the requirement on the precision of the control position of the oil pressure control valve is more strict; the PWM control duty ratio only controls the corresponding voltage, and thus cannot accurately control the change of the current and the electromagnetic force (the resistance of the oil pressure control valve is greatly changed in a low-temperature environment). At this time, if the duty ratio is not corrected, the control of VVT is affected, and an abnormal phenomenon such as phase fluctuation occurs. The current method for correcting the duty ratio by the temperature is to adopt water temperature data in an engine, calculate the temperature of engine oil according to a calibration calculation model, default to the condition that the temperature of the engine oil is consistent with the temperature of an engine oil pressure control valve, and correspondingly correct the duty ratio by the temperature of the engine oil. The problems of the method are that: in an extremely low temperature environment, the engine is started to be heated, and the temperature of the internal engine oil is different from that of the engine oil pressure control valve. The duty ratio cannot be accurately corrected by the water temperature of the engine because the temperature rise curves corresponding to different environmental temperatures are different.
Disclosure of Invention
The invention aims to provide a method, a system and a storage medium for correcting the control duty ratio of a phaser, so as to ensure that the VVT control uses the most appropriate duty ratio parameter, avoid the fluctuation of the VVT phase, improve the response speed and the stability of the VVT and improve the performance of an engine in a low-temperature environment.
In a first aspect, the present invention provides a method for correcting a duty cycle of a phaser, including:
the method comprises the following steps: starting the engine, acquiring the ambient temperature of the vehicle, and executing a second step if the ambient temperature is greater than a first preset temperature; if the ambient temperature is less than or equal to the first preset temperature, executing a third step;
step two: executing normal PID control logic, wherein the value of the P term is based on the calibrated engine water temperature TewAnd the rotating speed and the phase deviation value e (K) are calculated and output, namely P ═ f (K)p,e(k))；KpIs the column coefficient of the P term, KpThe value of (A) is determined by the engine water temperature TewDetermining a rotation speed, wherein a phase deviation value e (k) is a difference value between a k sampling target phase and an actual phase of the VVT; the value of the term I is represented by KIAnd integral determination of the phase deviation value e (K), where KIAn integral coefficient of the term I; data of D item is composed of KDAnd differential determination of the phase deviation value e (K), KDThe term D is the differential coefficient.
Step three: performing a modified PID control logic, i.e., estimating the engine oil control valve temperature T1, and modifying K in the term PpThe numerical value, the data of the I term and the D term are consistent with the data of the I term and the D term in the normal PID control logic, and the phase of the VVT is controlled based on the corrected PID, wherein KpThe value of (a) is determined by the estimated engine oil control valve temperature T1 and the rotating speed;
step four: obtaining the water temperature T of the engineewJudging the water temperature T of the engineewIf the temperature is higher than the second preset temperature and the engine starting time is higher than the first preset time, executing a second step if the temperature is higher than the second preset temperature and the engine starting time is higher than the first preset time; otherwise, executing the step five;
step five: controlling the phase of the VVT according to the corrected PID, when the delta value is smaller than a preset angle threshold value and the continuation time is larger than a second preset time, considering that the engine oil control valve enters a holding position, acquiring the duty ratio of the holding position, and estimating the temperature T2 of the engine oil control valve based on the duty ratio of the holding position;
step six: judging whether the difference value of the T1 and the T2 is smaller than a third preset temperature or not, if so, executing a step three; otherwise, executing step seven;
step seven: PID control logic performing feedback self-learning correction, i.e. modifying K in P termpThe numerical value, the data of the I term and the D term are consistent with the data of the I term and the D term in the normal PID control logic, and the phase of the VVT is controlled based on the corrected PID, wherein KpIs determined by the average of T2 and T1 and the rotational speed; and step four is executed.
Alternatively, the method for estimating the engine oil control valve temperature T1 is as follows:
obtaining the ambient temperature T of the vehiclevWater temperature T of engineewAnd a starting time te；
Based on the vehicle ambient temperature TvWater temperature T of engineewAnd a starting time teEstimating the temperature T1 of the engine oil control valve, wherein the calculation formula of T1 is T1＝F(Tv,Tew,te)。
Optionally, the first preset temperature is 0 ℃.
Optionally, the second preset temperature is 70 ℃; the first preset time is 10 minutes.
Optionally, the preset angle threshold is 2 °; the second preset time is 3 seconds.
Optionally, the third preset temperature is 5 ℃.
In a second aspect, the phaser control duty cycle correction system according to the present invention includes a memory and a controller, where the controller is connected to the memory, and the memory stores a computer readable program, and when the controller invokes the computer readable program, the method for controlling duty cycle correction by a phaser according to the present invention can be performed.
In a third aspect, the invention provides a vehicle, which adopts the phaser control duty cycle correction system according to the invention.
The invention has the following advantages:
(1) the environmental temperature and the starting time are introduced as correction input parameters, and the actual temperature at the engine oil control valve can be estimated more accurately by combining with the water temperature data of the engine, so that the duty ratio P term value of VVT control can be corrected.
(2) And establishing a feedback self-learning correction method by adopting the duty ratio value of the holding bit, and actually measuring the duty ratio value of the holding bit at different temperatures according to the characteristic that the holding bit current is not influenced by the temperature. Predicting the actual temperature at the oil control valve based on the duty ratio feedback value of the holding bit in the actual operation process; and a self-learning corrected control logic method is established by closed-loop control.
In conclusion, the invention ensures that the VVT control uses the most appropriate duty ratio parameter, avoids the fluctuation of the VVT phase, improves the response speed and the stability of the VVT, and improves the performance of the engine in a low-temperature environment.
Drawings
FIG. 1 is a flow chart of a conventional oil control valve;
FIG. 2 is a flowchart of the present embodiment;
FIG. 3 is a diagram illustrating the relationship between the duty cycle of the hold bit and the temperature in this embodiment;
FIG. 4 is a schematic diagram of the temperature rise curve of the ambient temperature of-30 ℃ in this example.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, the flow rate graph of the oil control valve shows that when the spool stroke is 1.5mm, the flow rate is at the minimum position, and at this time, the VVT system is at the holding position phase, the electromagnetic force and current required to hold the position are constant, and different duty ratio inputs are performed according to different oil control valve temperatures to generate the required electromagnetic force and current, so that when the holding position phase is maintained, the duty ratio and the oil control valve temperature have a linear relationship, and a table is prepared based on the measured data as shown in fig. 3.
The vehicle is started under different environmental temperatures under different working conditions, and the water temperature heating curve of the engine is different from the heating curve of the engine oil control valve. During development, the typical working condition of user operation can be simulated in different environmental temperatures, and the temperature rise curve of the engine water temperature and the engine oil control valve is actually measured in a test. As shown in fig. 4, the measured temperatures of the engine water temperature, the engine oil and the engine oil control valve (including a water temperature curve 1, an engine oil temperature curve 2, a temperature difference curve 3 between the engine oil control valve and the water temperature, a temperature difference curve 4 between the engine oil control valve and the engine oil, and an engine oil control valve temperature 5) at-30 ℃. Based on a large amount of test data, fitting out the water temperature T based on the engineewStart time teAnd the estimated temperature T1 at the oil control valve, thereby calculating the estimated temperature T1 at the oil control valve.
Due to the fact that factors such as the working condition of a user running the vehicle and the difference of engine hardware change, the estimated T1 and T2 have deviation. In this embodiment, when the deviation between the two is identified to be too large, the average value of the estimated temperatures is corrected.
The traditional VVT regulating duty ratio output is input by a PID control algorithm, and the control algorithm is as follows:
wherein u (k) is the duty ratio value output at the k-th sampling time; kpIs the proportionality coefficient of the P term; e (k) is the phase deviation value input at the k-th sampling moment; kIAn integral coefficient of the term I; kDThe term D is the differential coefficient. Since the value output of the P term has the largest influence on the duty cycle and can quickly reduce the error, in this embodiment, the duty cycle correction only corrects the proportionality coefficient of the P term. The I-term integration link is mainly used for eliminating static error and improving the zero-error degree of the system; the D item differential link reflects the variation trend of the deviation, and an effective early correction signal is introduced into the system for accelerating the action speed of the system and reducing the adjustment time, so the method does not relate to the correction of the I item and the D item.
As shown in fig. 2, in this embodiment, a method for correcting a duty ratio of a phaser, includes the following steps:
the method comprises the following steps: starting the engine, acquiring the ambient temperature of the vehicle, and executing a second step if the ambient temperature is greater than a first preset temperature; and if the ambient temperature is less than or equal to the first preset temperature (for example: 0 ℃), executing the third step.
Step two: executing normal PID control logic, wherein the value of the P term is based on the calibrated engine water temperature TewAnd the rotating speed and the phase deviation value e (K) are calculated and output, namely P ═ f (K)p,e(k))＝Kpe(k)；KpIs the scaling factor of the P term (i.e., the scaling factor value under normal PID control logic), KpThe value of (A) is determined by the engine water temperature TewDetermining a rotation speed, wherein a phase deviation value e (k) is a difference value between a k sampling target phase and an actual phase of the VVT; the value of the I term is represented by KIAnd integral determination of the phase deviation value e (k)Wherein, K isIIntegral coefficient of term I, KIIs determined based on the calibrated engine water temperature Tew, speed; data of D item is composed of KDAnd differential determination of the phase deviation value e (K), KDThe term D is a differential coefficient, KDIs the engine water temperature Tew, speed determination.
Step three: performing a modified PID control logic, i.e., estimating the engine oil control valve temperature T1, and modifying K in the term PpThe numerical value, the data of the I term and the D term are consistent with the data of the I term and the D term in the normal PID control logic, and the phase of the VVT is controlled based on the corrected PID, wherein KpThe value of (a) is determined by the estimated engine oil control valve temperature T1 and the rotating speed;
in this embodiment, the method for estimating the temperature T1 of the engine oil control valve includes:
obtaining the ambient temperature T of the vehiclevWater temperature T of engineewAnd a starting time te(ii) a Based on the vehicle ambient temperature TvWater temperature T of engineewAnd a starting time teAn oil control valve temperature T1 is estimated, where T1 is calculated as T1 ═ F (T)v,Tew,te)。
Step four: obtaining the water temperature T of the engineewJudging the water temperature T of the engineewIf the temperature is higher than a second preset temperature (for example, 70 ℃) and the engine starting time is higher than a first preset time (for example, 10 minutes), executing a second step; otherwise, executing step five.
Step five: and controlling the phase of the VVT according to the corrected PID, when the delta value is smaller than a preset angle threshold value (such as 2 degrees) and the continuation time is larger than a second preset time (such as 3 seconds), considering that the engine oil control valve enters a holding position, acquiring the duty ratio of the holding position, and estimating the temperature T2 of the engine oil control valve based on the duty ratio of the holding position.
Step six: judging whether the difference value of the T1 and the T2 is smaller than a third preset temperature (for example: 5 ℃), if so, executing a step three; otherwise, executing step seven.
Step seven: PID control logic performing feedback self-learning correction, i.e. modifying K in P termpData of values, I and D terms and normal PID control logicThe data of the I term and the D term in the edition are consistent, and the phase of the VVT is controlled based on the corrected PID, wherein KpIs determined by the average of T2 and T1 and the rotational speed; and step four is executed.
In this embodiment, a system for correcting duty ratio under control of a phaser includes a memory and a controller, the controller is connected to the memory, a computer readable program is stored in the memory, and when the controller calls the computer readable program, the method for correcting duty ratio under control of the phaser as described in this embodiment can be executed.
In this embodiment, a vehicle employs the phaser control duty cycle correction system as described in this embodiment.
Claims (8)
1. A method for correcting a control duty cycle of a phaser is characterized by comprising the following steps:
the method comprises the following steps: starting an engine, acquiring the ambient temperature of the vehicle, and executing a second step if the ambient temperature is greater than a first preset temperature; if the ambient temperature is less than or equal to the first preset temperature, executing a third step;
step two: executing normal PID control logic, wherein the value of the P term is based on the calibrated engine water temperature TewAnd the rotating speed and the phase deviation value e (K) are calculated and output, namely P ═ f (K)p,e(k))；KpIs the column coefficient of the P term, KpThe value of (A) is determined by the engine water temperature TewDetermining a rotation speed, wherein a phase deviation value e (k) is a difference value between a k sampling target phase and an actual phase of the VVT; the value of the term I is represented by KIAnd integral determination of the phase deviation value e (K), where KIAn integral coefficient of the term I; data of D item is composed of KDAnd differential determination of the phase deviation value e (K), KDThe term D is a differential coefficient;
step three: performing a modified PID control logic, i.e., estimating the engine oil control valve temperature T1, and modifying K in the term PpThe numerical value, the data of the I term and the D term are consistent with the data of the I term and the D term in the normal PID control logic, and the phase of the VVT is controlled based on the corrected PID, wherein KpThe estimated temperature of the engine oil control valveDegree T1 and speed determination;
step four: obtaining the water temperature T of the engineewJudging the water temperature T of the engineewIf the temperature is higher than the second preset temperature and the engine starting time is higher than the first preset time, executing a second step if the temperature is higher than the second preset temperature and the engine starting time is higher than the first preset time; otherwise, executing the step five;
step five: controlling the phase of the VVT according to the corrected PID, when the delta value is smaller than a preset angle threshold value and the continuation time is larger than a second preset time, considering that the engine oil control valve enters a holding position, acquiring the duty ratio of the holding position, and estimating the temperature T2 of the engine oil control valve based on the duty ratio of the holding position;
step six: judging whether the difference value of the T1 and the T2 is smaller than a third preset temperature or not, if so, executing a step three; otherwise, executing step seven;
step seven: PID control logic performing feedback self-learning correction, i.e. modifying K in P termpThe numerical value, the data of the I term and the D term are consistent with the data of the I term and the D term in the normal PID control logic, and the phase of the VVT is controlled based on the corrected PID, wherein KpThe values of (d) are determined from the average and rotational speed of T2 and T1; and step four is executed.
2. The phaser control duty cycle correction method of claim 1, wherein: the method for estimating the engine oil control valve temperature T1 comprises the following steps:
obtaining the ambient temperature T of the vehiclevWater temperature T of engineewAnd a starting time te；
Based on the vehicle ambient temperature TvWater temperature T of engineewAnd a starting time teEstimating the temperature T1 of the engine oil control valve, wherein the calculation formula of T1 is T1＝F(Tv,Tew,te)。
3. The phaser control duty cycle correction method of claim 2, wherein: the first preset temperature is 0 ℃.
4. The phaser control duty cycle correction method of claim 3, wherein: the second preset temperature is 70 ℃; the first preset time is 10 minutes.
5. The phaser control duty cycle correction method of claim 4, wherein: the preset angle threshold is 2 degrees; the second preset time is 3 seconds.
6. The phaser control duty cycle correction method of claim 5, wherein: the third preset temperature is 5 ℃.
7. A phaser controlled duty cycle correction system comprising a memory and a controller, the controller coupled to the memory, wherein: the memory stores a computer readable program, and the controller, when invoking the computer readable program, can perform the steps of the phaser controlled duty cycle correction method of any of claims 1-6.
8. A vehicle, characterized in that: the phaser control duty cycle correction system of claim 7.
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